Can Diffusion Weighted Imaging Aid in Differentiating Benign from Malignant Sinonasal Masses?: A Useful Adjunct

Area of Science:

• Radiology
• Oncology
• Medical Imaging

Background:

• Sinonasal masses present a diagnostic challenge.
• Conventional imaging often shows overlapping features.
• Diffusion weighted imaging (DWI) offers advanced characterization.

Purpose of the Study:

• To evaluate the role of DWI and apparent diffusion coefficient (ADC) values at 3 Tesla in characterizing sinonasal masses.
• To differentiate between benign and malignant sinonasal lesions.

Main Methods:

• Magnetic resonance imaging (MRI) with DWI at 3 Tesla was performed on 79 patients.
• Analysis included morphological, qualitative DWI, and quantitative ADC assessment.
• Receiver operating characteristic (ROC) curve analysis determined a cut-off ADC value.

Main Results:

• Mean ADC values differed significantly between benign (1.948×10^-3 mm²/s) and malignant (1.046×10^-3 mm²/s) sinonasal masses (p=0.004).
• A cut-off ADC of 1.791×10^-3 mm²/s achieved 80% sensitivity and 83.3% specificity for malignancy.
• Juvenile nasopharyngeal angiofibroma (JNA) exhibited high ADC values; meningioma showed restricted diffusion.

Conclusions:

• DWI combined with conventional imaging can improve diagnostic accuracy for sinonasal masses.
• Distinct diffusion characteristics aid in identifying specific entities like JNA and meningioma.
• ADC values are valuable for differentiating benign from malignant sinonasal lesions.